If you didn't watch his lightning talk yet, then you might have missed some of the great features that are bundled into this tool.
Even if you didn't test it yet, chances are you'll be able to get it with very little work since Nuclide is a package completely built on top of Atom.

Nuclide is built as a single package on top of Atom to provide hackability and the support of an active community. It provides a first-class development environment for React Native, Hack and Flow projects.